JP5567931B2 - Wheelchair wheel lock device - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a wheel lock device for a wheelchair, and more particularly to a wheel lock device for a wheelchair that automatically locks the rotation of a wheel when a user leaves a seating surface.

  Conventionally, when getting off a wheelchair, the brake is operated so that the wheelchair does not move freely, so that the wheels do not move and are separated. However, if you stand up while supporting the wheelchair without inadvertently operating the wheelchair when you leave the wheelchair, there is a danger that the wheelchair will start to move on its own and the user will fall. For this reason, for example, in the wheelchair described in Patent Document 1, the brake is automatically applied when the wheelchair is separated from the wheelchair, and the brake is automatically released when the user is seated.

  However, in the wheelchair described in Patent Document 1, since the brake is applied or released via the brake wire, the wire is expected to elongate over time, and the amount of movement of the wire must be constantly adjusted. There was a problem.

  Therefore, the applicant of the present invention is a device that locks a wheel of a wheelchair when the disc is fixed to the wheel and the engagement pin of the disc is engaged with and disengaged from the disc with the annular engagement hole disposed around the disc. The wheel lock device of the wheelchair comprised with the main body was proposed (refer patent document 2). According to this wheel lock device for a wheelchair, its movement does not change due to secular change, it can be used with peace of mind, and since the wheel is directly locked, the wheel can be reliably locked.

JP 2003-153961 A JP 2010-99314 A

  However, in the conventional wheel lock device as described above, since the wheel lock is automatically released at the time of sitting, when the chair is seated with momentum, the lock is released and the wheelchair retreats unexpectedly, There was a risk of hitting a caregiver.

  Then, this invention makes it a subject to provide the wheel lock apparatus of the wheelchair which can perform the lock release of the wheel at the time of sitting safely and reliably.

  The present invention has been made to solve the above-described problems, and is characterized by the following.

(Claim 1)
The invention described in claim 1 is characterized by the following points.

  That is, the wheel lock device for a wheelchair according to claim 1 is a wheel lock device for a wheelchair that automatically locks the rotation of the wheel when the user leaves the seating surface, and is fixed to the wheel in the circumferential direction. A disc having engagement holes arranged at equal intervals, and a device body provided with a brake pin that can be inserted into and removed from the engagement hole of the disc. When the load is applied to the seating surface, the brake pin is acted in a direction to be removed from the engagement hole, and the load is removed from the seating surface. The brake pin is acted in a direction in which the brake pin is inserted into the engagement hole, and a notch is provided on the outer periphery of the control pin, and the notch is inserted into the engagement hole. Engaged with the periphery of the through-hole provided in the device body And wherein the Rukoto.

(Claim 2)
The invention described in claim 2 has the following features in addition to the features of the invention described in claim 1 described above.

  That is, the engagement between the notch and the through hole is released when the brake pin is pushed and released when the wheel is rotated in the forward direction.

  The invention according to claim 1 is as described above, and when the brake pin is inserted into the engagement hole and locks the rotation of the wheel, the notch is engaged with the through hole, and then the brake pin is engaged. The lock is not released even if it is applied in the direction to be removed from the hole. For this reason, in order to unlock the wheel, it is not sufficient to sit down and lower the seating surface (this action causes the braking pin to be removed from the engagement hole). It is necessary to release the engagement. For this reason, the wheelchair does not move unexpectedly when sitting, and the wheel can be unlocked safely and reliably.

  Also, the invention according to claim 2 is as described above, and the engagement between the notch and the through hole is released when the brake pin is pushed and the wheel is rotated in the forward direction. It has become so. For this reason, the disengagement between the notch and the through hole is realized by an operation in which the wheel rotates in the forward direction, and the lock is naturally released without performing a special operation. .

It is an external view of a wheelchair. It is explanatory drawing which shows the state which a wheel locking device locks a wheel. It is explanatory drawing which shows the state in which a wheel locking device cancel | releases the lock | rock of a wheel. It is explanatory drawing which shows the wheel locking device when a wheelchair is folded. It is explanatory drawing which shows a mode that a load is applied to the seat surface of a wheelchair. It is sectional drawing of the wheel lock apparatus which shows the state by which the load is applied to the seat surface of the wheelchair and the notch and the through-hole are engaging. It is a cross-sectional perspective view of a wheel lock device showing a state in which the wheel is rotated in the forward direction and the engagement between the notch and the through hole is released. It is sectional drawing of the wheel locking device which shows the state by which engagement with the notch and the through-hole was cancelled | released.

  FIG. 1 shows a perspective view of a wheelchair A to which a wheel lock device B of a wheelchair according to the present invention is applied. The wheel lock device B (hereinafter referred to as a lock device) B of the wheelchair A is fixed to a frame 1 of the wheelchair A. The apparatus main body 2 and a disk 4 fixed to the wheel 3 of the wheelchair A are provided.

  The apparatus main body 2 is provided inside each of the two wheels on both sides. As shown in FIG. 2, the apparatus main body 2 is rotatably supported by the support member 10 fixed to the frame 1 and the upper end of the support member 10. The rotating member 13, the operating member 15 attached to the lower surface of the rotating member 13 via the support shaft 14, the braking pin 16 attached to the lower part of the operating member 15, and the support member 10. And the engagement plate 5 fixed to the frame 1 of the wheelchair A via the main body. The rotating member 13 can be rotated up and down about the support shaft 11 as a rotating shaft, and is biased upward by a spring (not shown).

  As shown in FIG. 2 and the like, a sensor arm 17 that protrudes upward so as to engage with the back surface of the seat surface 6 is fixed to the rotating member 13. The sensor arm 17 includes a first sensor arm 17a that protrudes obliquely forward and a second sensor arm 17b that protrudes obliquely rearward. The first sensor arm 17a is disposed at the front portion of the seat surface 6, The second sensor arm 17 b is disposed so as to correspond to the central portion of the seat surface 6. For this reason, even if a user sits in the front part of the seating surface 6, the movement of the seating surface 6 can be sensed in the same manner as when sitting at the center of the seating surface.

  The roller 20 is attached to the upper part of the operating member 15, and the rear end 16 b of the braking pin 16 disposed so as to penetrate the through hole 5 a provided in the engaging plate 5 is provided to the lower part of the operating member 15. It is supported.

  The roller 20 is adapted to engage with an engaging portion 21 formed on the support member 10 when the operating member 15 is lowered or raised. The engaging portion 21 is composed of two engaging portions of a first engaging portion 22 and a second engaging portion 23 that project obliquely from the support member 10 toward the operating member 15 side. The engaging portion 22 and the second engaging portion 23 are projected in a direction in which the tips are opposite to each other, and are formed in a C shape in a side view.

  The first engaging portion 22 is configured such that the user sits in a wheelchair, the seat surface 6 is lowered, the sensor arm 17 is pushed down by the seat surface 6 and pivots downward, and the pivot member 13 integrated with the sensor arm 17 is integrated. Is formed at a position to engage with the roller 20 when the operating member 15 is lowered (see FIG. 3).

  In addition, the second engaging portion 23 folds the wheelchair A, the seat surface 6 releases the pressing force of the sensor arm 17, and rotates upward until the sensor arm 17 becomes almost vertical. Is also formed at a position that engages with the roller 20 when the actuating member 15 is raised (see FIG. 4).

  As described above, when the roller 20 is engaged with the first engagement portion 22 or the second engagement portion 23, the operation member 15 is rotated about the support shaft 14 in a direction away from the disk 4. Yes.

  As shown in FIG. 6, the brake pin 16 has a rear end 16 b that passes through the operating member 15 and is slidably fixed back and forth, and a front end 16 a that penetrates the through hole 5 a of the engagement plate 5 to the disk 4. It is arranged to hit. The brake pin 16 is formed so as to be able to be inserted into and removed from the engagement hole 8 formed in the disk 4, and the tip 16 a is formed so as to be able to penetrate into the engagement hole 8. In addition, a notch 16c that engages with the periphery of the through hole 5a of the engagement plate 5 is provided on the upper outer periphery of the brake pin 16 (see FIGS. 6 to 8).

  The braking pin 16 is attached to the lower part of the operating member 15 and responds to a load applied to the seat surface 6. That is, the brake pin 16 acts in the direction in which the brake pin 16 is inserted into the disk 4 as shown in FIG. 2 when the load is removed from the seat surface 6 and the operating member 15 moves in the direction approaching the support member 10. It is supposed to be. In addition, the brake pin 16 is acted in the direction of separating from the disk 4 as shown in FIG. 3 when the actuating member 15 moves in a direction away from the support member 10 due to a load applied to the seat surface 6. (As will be described later, since the notch 16c of the brake pin 16 and the through hole 5a of the engagement plate 5 are engaged, the actuating member 15 moves away from the support member 10 as described later. The brake pin 16 does not move only by moving, which will be described in detail later).

  The disk 4 is fixed to the frame 1 side of the wheel 3, and the engagement holes 8 are disposed around the disk 4 at equal intervals in the circumferential direction. The engagement hole 8 is formed as a long hole extending radially, and the width of the engagement hole 8 in the short direction is formed such that the tip 16a of the brake pin 16 described above can penetrate. The brake pin 16 described above is disposed in the vicinity of the foremost end of the disk 4, and the brake pin 16 is formed in the engagement hole 8 in the vicinity of the foremost end of the disk 4 so that it can be inserted and removed.

  According to the locking device B according to the present embodiment, when the user leaves the seat 6 of the wheelchair A, the push-down of the sensor arm 17 is released. Therefore, as shown in FIG. And turn upward. The actuating member 15 is raised until the engagement between the roller 20 and the first engaging portion 22 is released. However, since the sensor arm 17 is in contact with the seat surface 6, the amount of rotation is limited, and the second engaging member 15 is engaged. It does not rise until it engages with the joint 23. Accordingly, the actuating member 15 rotates counterclockwise around the support shaft 14 and moves downward in a direction approaching the support member 10, so that the brake pin 16 moves in a direction in contact with the disk 4. The tip 16 a of the braking pin 16 facing the engagement hole 8 is immersed in the engagement hole 8. At this time, a notch 16c provided on the outer periphery of the brake pin 16 engages with the peripheral edge of the through hole 5a of the engagement plate 5, which will be described later.

  When the tip 16a of the braking pin 16 is immersed in the engagement hole 8 in this way, the rotation of the disk 4 is prevented, and as a result, the rotation of the wheel 3 is also prevented, and the wheel 3 is locked. When the user floats from the wheelchair A, the wheel 3 is automatically locked, and an accident that the wheelchair A starts to move freely and the user falls can be prevented.

  Thus, since the brake pin 16 automatically engages with the engagement hole 8 of the disk 4 when the user leaves the seat surface 6 of the wheelchair, the wheel according to the use mode without the user being aware of it. The rotation of 3 is automatically locked.

  On the other hand, when the user sits on the wheelchair A, as shown in FIG. 5, the seat surface 6 is lowered, and the sensor arm 17 (rotating member 13) rotates downward about the support shaft 11 against the spring. Therefore, the operating member 15 is lowered (see FIG. 3). When the actuating member 15 is lowered, the roller 20 engages with the first engaging portion 22 and rides on the first engaging portion 22, so that the actuating member 15 rotates outwardly around the support shaft 14 in a direction away from the support member 10. It will move. Then, the braking pin 16 is caused to act in a direction away from the disk 4.

  By the way, as described above, when the tip 16a of the brake pin 16 is inserted into the engagement hole 8, the notch 16c provided on the outer periphery of the brake pin 16 engages with the peripheral edge of the through hole 5a of the engagement plate 5. It is like that. For this reason, even if the braking pin 16 is made to act in a direction away from the disk 4, the engagement between the notch 16c and the through hole 5a is not released, so that the tip 16a of the braking pin 16 is shown in FIG. Remains inserted into the engagement hole 8.

  Specifically, the rear end 16 b of the brake pin 16 is connected to the actuating member 15 via a compression spring 25, and the rear end 16 b of the brake pin 16 is attached in a direction away from the disk 4 by the compression spring 25. It is energized. That is, the braking pin 16 is slidable with play in the longitudinal direction by providing the compression spring 25. For this reason, even if the actuating member 15 moves in the direction away from the support member 10, the compression spring 25 can absorb this amount of movement, and the braking pin 16 is acted in the direction away from the disk 4. In addition, the brake pin 16 can be maintained in the locked state. In other words, as long as the notch 16c and the through hole 5a are engaged, the brake pin 16 remains inserted into the engagement hole 8 against the force applied to the operating member 15. . Further, the brake pin 16 is biased to be lifted upward by the tension spring 24, and the engagement between the notch 16c and the through-hole 5a is performed unless a force pressing the brake pin 16 downward is applied. Is not released.

  However, when the wheel 3 is rotated in the forward direction in this state, as shown in FIG. 7, the disk 4 is rotated together with the wheel 3, and the braking pin 16 inserted into the engagement hole 8 is moved downward. It is pushed. Then, since the braking pin 16 moves downward against the spring force of the tension spring 24, the engagement between the notch 16c and the through hole 5a is released. Then, as shown in FIG. 8, the braking force of the compression spring 25 moves the braking pin 16 in the direction in which it is removed from the engagement hole 8, and the rotation lock of the wheel 3 is released. As a result, the user can continue to rotate the wheel 3 in the forward direction and move.

  As described above, according to the present embodiment, when the brake pin 16 is pushed out and inserted into the engagement hole 8 of the disk 4 to lock the wheel 3, the notch 16c provided in the brake pin 16 and The through hole 5a of the engagement plate 5 is engaged. Thereby, since the movement of the brake pin 16 is suppressed, in addition to the load being applied to the seat surface 6, the brake pin 16 is not retracted unless the disk 4 (ie, the wheel 3) is rotated in the forward direction. It is formed as follows. For this reason, the wheel 3 is not unlocked only by the user sitting on the seating surface 6, and the wheelchair does not retreat unexpectedly even when the user sits with momentum. That is, there is no danger of hitting an assistant, and the wheel 3 can be unlocked safely and securely.

  Further, since the engagement of the notch 16c is formed by rotating the wheel 3 in the forward direction, the wheel 3 can be moved in the forward direction without any special operation. The lock can be released by a natural operation of rotating, and a lock device with good operability can be provided.

DESCRIPTION OF SYMBOLS 1 Frame 2 Apparatus main body 3 Wheel 4 Disc 5 Engagement plate 5a Through hole 6 Seat surface 8 Engagement hole 10 Support member 13 Rotating member 15 Actuating member 16 Brake pin 16a Front end 16b Rear end 16c Notch 17 Sensor arm 20 Roller 21 Engagement Joint part 24 Tension spring 25 Compression spring A Wheelchair B Wheel lock device

Claims (2)

A wheel lock device for a wheelchair that automatically locks the rotation of the wheel when the user leaves the seat,
A disk fixed to the wheel and provided with engagement holes at equal intervals in the circumferential direction;
An apparatus main body including a braking pin formed so as to be insertable / removable with respect to the engagement hole of the disk;
With
The brake pin responds to a load applied to the seat surface, and when a load is applied to the seat surface, the brake pin is acted in a direction to be removed from the engagement hole, When there is no load from the seating surface, the braking pin is acted in a direction to be inserted into the engagement hole,
Furthermore, a notch is provided in the outer periphery of the control pin, and this notch engages with a peripheral edge of a through hole provided in the apparatus main body when the control pin is inserted into the engagement hole. A wheel lock device for a wheelchair, characterized in that.   The wheel lock of the wheelchair according to claim 1, wherein the engagement between the notch and the through hole is released when the brake pin is pushed by rotating the wheel in a forward direction. apparatus.

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